Toxic product and method of making same.



JUDSON A. 'DE CEW,1OF MONTREAL, QUEBEC, CANADA.

TOXIC PRODUCT AND METHOD OF MAKING SAME.

No Drawing.

To all whom/it may concern:

Be it known that I, Jonson A.DE (Law, a subject of the King of Great Britain, and resident of the city of Montreal, in theProvince of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Toxic Products and Methods of MakingSame, of which the following is a full, clear, and exact description.

This inventionlrelates to a new and useful material particularlyadapted for the preservation or impregnation of wood and like fibro-cellular material.

- The poisonous and germicidal properties of arsenic are well. known, and it is also known that the only real soluble forms of arsenic are the compounds of arsenic with soluble alkalis. are strongly poisonous, it is apparent that they are not suitable for the impregnation of wood because of the free alkali having an injurious effect upon the fibro-cellular material.

My invention consists essentially in the discovery ofa new product which is a soluble arsenical compound that 'is not definitely alkaline. In obtaining thisproduct, I make use of certain properties existing in the organic or colloidal matter present waste sulfite liquor from pulp mills. These-materials have the property of uniting under certain conditions with a metallic base, and will hold it in solution when neutral or slightly acid.

My method of producing this arsenical compound is as follows :-To the waste 'sulfite liquors recovered from pulp mills, I add a soluble 'arsenical compound, such as sodium arsenite or any solution of arsenic in a soluble alkali. The resultant product obtained is an alkaline arsenical compound with the sulfo-o'rganic material present. The quantity of arsenic introduced into the mixture depends on the toxic eflect desired. This product would .be suitable as a preservative material for wood if it did not have the alkaline characteristics of arsenical solutions. In order to remove the alkaline property of the compound, I neutralizethe Specification of Letters Patent.

Although. these materials Patented Oct. 5, 1915.

Application fi1edFebruary25,-1914. Serial No. 820,956.

and which is suitable for impregnating wood or can be used for any other purpose where toxic materials are required. This product may be prepared during the concentration of the waste sulfite liquor, or the arsenical compound may be added to the concentratedproduct after its preparation. Various oils which are used in making wood preserving compounds may be incorporated into this product while in its concentrated condition.

Having thus described my invention, what I claim'is:

1. A product consisting of a non-alkaline arsenical compound of the organic colloidal materials of waste sulfite liquor.

2. A product consisting of an arsenical compound of the organic materials of waste sulfite liquor, which is slightly acid in character. 3. A product consisting of an arsenical compound with the organic material of waste sulfite liquor combined with oil.

4. A process of preparing an arsenical compound, which consists in adding an alkaline arsenical compound to waste sulfite liquor, and then neutralizing the product.

5. A process of making an-arsenical compound, which consists in adding an alkaline 'arsenical compound to the organic matter of .waste sulfite liquor, and then rendering the compound slightly acid in character.

. In witness whereof, I have hereunto set my hand, in the presence of'two witnesses.

. JUDSON A. DE CEW.

Witnesses: Y R

C. W. TAYLoR, G. M. MORELAND. 

